http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
초정밀 자유곡면 가공용 long stroke fast tool servo의 설계 및 특성 평가
김호상(Ho-Sang Kim),이광일(Kwang-Il Lee) Korean Society for Precision Engineering 2009 한국정밀공학회지 Vol.26 No.2
Long stroke Fast Tool Servo (LFTS) with maximum stroke of 432 ㎛ is designed, manufactured and tested for fabrication of optical free-form surfaces. The large amount of stroke in LFTS has been realized by utilizing the hinge and lever mechanisms which enable the displacement amplification ratio of 4.3. In this mechanism the peculiar shape was devised for maximizing the displacement of end tip in LFTS and special mechanical spring has been mounted to provide the sufficient preload to the piezoelectric actuator. Also, its longitudinal motion of tool tip can be measured by capacitive type displacement sensor and closed-loop controlled to overcome the nonlinear hysteresis. In order to verify the static and dynamic characteristics of designed LFTS, several features including step response, frequency response and cut-off frequency in closed-loop mode were experimentally examined. Also, basic machining result shows that the proposed LFTS is capable of generating the optical free-form surface as an additional axis in diamond turning machine
김호상(Ho Sang Kim),김창길(Chang Gil Kim),김이청(Yi Cheong Kim),김종렬(Jong Ryeol Kim) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.4
Artificial reefs are widely used as important means of fishing ground creation for not only commercial fishing but also recreational fishing. The evaluation of artificial reef in this study was made based upon three steps, estimation of effective bulk void volume, catch analysis per unit reef volume and biomass estimation of attachment organisms on the reef. This method can be applied to both the evaluation for post-deployment management of the exist artificial reefs and for the preservation of fisheries resource at the artificial reef fishing grounds.